1. Tardigrade
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  3. Chemistry
  4. Which of the following is the strongest base in aqueous solution ?

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Q. Which of the following is the strongest base in aqueous solution ?

AIEEEAIEEE 2007Amines

Solution:

Note : Aromatic amines are less basic than aliphatic amines. Among aliphatic amines the order of basicity is $2^{\circ} > 1^{\circ} > 3^{\circ}$. The electron density is decreased in 3° amine due to crowding of alkyl group over N atom which makes the approach and bonding by a proton relatively difficult. Therefore the basicity decreases. Further Phenyl group show - I effect, thus decreases the electron density on nitrogen atom and hence the basicity.
$\therefore $ Dimethylamine ($2^{\circ}$ aliphatic amine) is strongest base among given choices.
$\therefore $ The correct order of basic strength is
Dimethylamine > Methyl amine > Trimethyl amine > Aniline.PRACT